Precision-tool.



u. P. ONBILL.

' PRECISION TOOLl l .APPLICATION FILED JAN. 2, 1908.

` Patented Nov. 17,1908.

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UNITEDI sTATEs PATENT o-EEICE.

CHARLES P. ONEILL, Ol" HARTFORD, CONNECTICUT.

PRECISION-TOOL.

No. 904,007'.l

Specification of Letters Patent.

Patented Nov. 17, 19708.

Application filed January 2, 1908. Serial No. 409,061.

To all whom t may concern:

Be it known that I, CHARLES P. ONEILL, a. citizen of the United States, residing at Hartford, in the county of Hartford an'd State of Connecticut, have invented a new and useful lImprovement in Precision-Tools, of which the following is a specification.

This device is designed to be applied to the dead spindle or similar part of a lathe or grinding or polishing machine, more particularly to those machines known as precision or watchmakers tools, for the purpose of steadying stock which is to be turned, ground, knurled, filed or polished, and -it is also capable of being used as an exterior and l1nter1or caliper.

The object of the invention is to provide a. Simple and cheap device which can be quickly applied by any one tothe dead spindle or corresponding part vof a. lathe, screwA cutting or similar turning machine., or a grinding, olishing or iinishing machine, and readily adjusted soas to support the stock to be 4operated upon at the point best' calculated torhold it steady in order that the cut orvother operation Willehe accomplished truly and uniformly, or'may be utilized to accurately measure the work.

The device illustrated as embodying the invention has an arm that is adapted to be ladjnstably. clamped to thedead spindle or other stationary part of the" machine,'and that adjustably holds a post which at its outer end carries a supporting or caliper nger that can be accurately adjusted trans versely of the post by a feed screw 'and can be clamped in any desired position by a clamping bolt and binding screw mounted in the end of the post.

Figure 1 of the drawings shows a plan of the device illustrating its use. Fig. 2 is a view looking at the device from one end. Fig. 3 shows a section of the head of the post witha supporting4 nger, linger adjusting or calipering screw, clamping bolt' and binding screw. Fig. 4 shows dierent forms of steadying and calipering lingers I that may be used.

The arm 1 which is shown in the drawings has an opening 2 of the required size to lit the spindle or other part to which the device is to be applied. If it is necessaryto reduce the size of the opening, bushings may be inserted into the opening.- One side of the arm 'is slitted and the slitted side profinger 7. The end of the finger that projects toward the axis of the Work may be notched as shown in Figs. 1 and 2, or forked as shown at 8 in Fi-g. 4 for the purpose of steadying a piece of stock, 'or may be provided With a flanged head 9 of any. desired size and shape for backing up or supporting stock, or may Ahave a pointed end, as shown at 10, for external calipering, or may ca rry an adjustable stud 11 for internal calipering,v

as shown in Fig. 4. The other end of the finger preferably has a groove 12 into which extends the edge of a collar 13 on the screuv 1l which is provided with a thumb piece 15 by means of which it. may be turned. The threads of this screw may be cut fine so that when the .screw is turnedthe-finger can be moved in or out with great accuracy. and the edge of the collar can be graduated and made to register with an index point 16 soas to give a micrometer reading for the move- Vment of the finger.

In a socket in the end of the post is a bolt 17 which has a notch 18. This bolt is adapt- 'ed to bear against the flattened side of the finger. Engaging the wall of the notch in the bolt is the pointed end of a screw 19 which is provided with a thumb piece 20..

By turning'this screw the bolt may be forced against the side of the finger so as to prevent it from turning around and moving longitudinally, or the bolt may be loosened so that the finger can Vbe adjusted by turningthe micrometer screw.

The exterior of the finger may be provided with graduations of any desired character in order that the amount of its movement or longitudinal adjustment may be readily determined. If the finger has a notch, fork or flange it maybe used tosupport and steady stock. If it has a point it may be used as an external caliper, and if itis provided with a stud, it may bev used as an internal caliper. The finger, for whatever purpose it is used,

is easily, quickly and accurately set in the desired position by turning the micrometer screw and then securely clamped in that posiv tion by turning the binding screw.

The arm can be mounted on the spindle so that the post will extend parallel with the 'work Aabove or below or on any side. The post is longitudinally adjustable and also rotarily adjustable in the arm so that the rest or caliper finger can be moved to the re quired position longitudinally of the stock, andl can be turned so that the'finger will project above, below or any side and back up or caliper the stock at any point, and the finger can be adjusted inwardly and outwardly in any of ,these positions with great nicety for I .accurately calipering external or internal diameters. lith y.this device pieces of smalll diameter and' considerable length can be backed, steadicd or calipered Aso that the cnt or other operation performedcan be made true and accurate.`

v The invention lclaimed is:

l. A precision tool having an arm with an opening adapted to be clamped -to a machine spindle, a post -e-Xtending transversely through and longitudinally adjustable in the arm, a finger extending transversely through and longitudinally adjustable in the post 'and a screw in the post for adjusting the finger toward and lf rom the axis of the spindle-opening inthe arm, substantially as specified.

2. A precision tool having an arm with an opening' adapted to be adj ustably clamped to' a machine spindle, a post extending transversely through and rotarily and longitudinally adjustable in the arm, a finger extending transversely through and adjustable in the vend of the post and a screw in the post for adjusting the nger toward and from the axis of the spindle-opening in the arm, substantially as specified.

3. A precision tool having an arm with an opening adapted to be rotarily mounted on and clamped toa machine spindle, a post longitudinally add rotarilyY adjustable 1n a transverse opening in the arm, a finger eX tending throuO'h the end 'ofthe post transversely thereof and a screw in the post for adjusting the finger toward and .from the axis of the spindle opening in the arm, substantially as specified.

4. A precision tool having an arm with an opening adapted to be rotarily mounted upon a spindle, a post longitudinally and ro tarily adjustable in an opening in the arm, a finger projecting through the end of the post transversely thereof, a screw for adjusting the finger and a screw for binding the finger, substantially as specified.

5. A precision tool having an arm with an opening adapted to be rotarily mounted upon a spindle, a post longitudinally and rotarily adj ustable in an opening in the arm, a

'finger projecting through the end of the post transversely thereof, a screw for adjusting the nger longitudinally, a bolt for clamping the finger and a screw for binding the bolt, substantially as specified.

6.. A precision tool, having a longitudinally and rotarily adjust-able post, a finger movable transversely of the post, said finger having a grooved head, a micrometer screw with a collar extending into the groove for adjusting the finger longitudinally ofthe post, a clamping bolt adapted to secure the finger, and a screw engaging and adapted to bind the bolt, substantially as specified.

^ CHARLES P. ONEILL. Witnesses:

.HARRY R. VVILLIA'Ms,

Josnrmnn M. STREMPFER. 

